Adobe-Consulting-Services#36 SlingPostProcessor Example

bundle/src/main/java/com/adobe/acs/samples/servlets/impl/SlingPostProcessorSample.java

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+package com.adobe.acs.samples.servlets.impl;
+
+import org.apache.felix.scr.annotations.Component;
+import org.apache.felix.scr.annotations.Service;
+import org.apache.sling.api.SlingHttpServletRequest;
+import org.apache.sling.api.resource.ModifiableValueMap;
+import org.apache.sling.api.resource.Resource;
+import org.apache.sling.servlets.post.Modification;
+import org.apache.sling.servlets.post.SlingPostProcessor;
+
+import java.util.List;
+import java.util.UUID;
+
+
+/**
+ * SlingPostProcessor's are called after a POST operation of the default SlingPostServlet but before changes are
+ * persisted to the repository.
+ *
+ * @link https://sling.apache.org/documentation/bundles/manipulating-content-the-slingpostservlet-servlets-post.html#slingpostprocessor
+ * @link https://sling.apache.org/apidocs/sling7/org/apache/sling/servlets/post/SlingPostProcessor.html
+ */
+@Component
+@Service
+public class SlingPostProcessorSample implements SlingPostProcessor {
+
+    @Override
+    public void process(SlingHttpServletRequest request, List<Modification> modifications) throws Exception {
+        // First, check if our post processor implementation needs to do anything
+        // Note: all registered SlingPostProcessor instances are called on all invocations of the Sling POST Servlet
+        if (accepts(request)) {
+
+            // Apply your custom changes: first, adapt the resource to a ModifiableValueMap
+            final Resource resource = request.getResource();
+            final ModifiableValueMap properties = resource.adaptTo(ModifiableValueMap.class);
+
+            // Example: add an additional property to the resource
+            String uuid = UUID.randomUUID().toString();
+            properties.put("myapp.versionHash", uuid);
+
+            // Record a "MODIFIED" entry in the modifications list
+            modifications.add(Modification.onModified(resource.getPath()));
+        }
+    }
+
+    protected boolean accepts(SlingHttpServletRequest request) {
+        // If you want to modify only certain resources, you can check on the resource's "sling:resourceType"
+        return "my-app/components/fancy-resource-type".equals(request.getResource().getResourceType());
+    }
+
+}